| Parameter |
Value |
| Designation |
C/2020 K6 (Rankin) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-09-15T13:36:00.020160Z |
| Orbit solution date (soln_date, UTC) |
2023-06-30T22:15:05Z |
| Obs used |
180 |
| NEO |
- |
| M1 |
12.000 |
| K1 |
5.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-05-26T08:55:19.200000Z |
| Discovery magnitude (MPC) |
20.50 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-01-04.0000000 |
| e |
1.00320001 |
| q (au) |
5.868420 |
| a (au) |
-1833.877552 |
| i (deg) |
103.645272 |
| Ω (om, deg) |
291.528614 |
| ω (w, deg) |
44.307127 |
| M (ma, deg) |
0.001386 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.183 + 2.419\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.183 |
| n |
2.419 |
| gf |
0.999 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
10.000 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
09:36:15.99 |
+53:30:21.4 |
HIP 47113 |
12.57 |
| 2026-09-20 12:00 |
09:36:24.29 |
+53:30:21.1 |
HIP 47113 |
12.78 |
| 2026-09-21 00:00 |
09:36:32.53 |
+53:30:21.5 |
HIP 47113 |
13.12 |
| 2026-09-21 12:00 |
09:36:40.69 |
+53:30:22.6 |
HIP 47113 |
13.57 |
| 2026-09-22 00:00 |
09:36:48.79 |
+53:30:24.3 |
HIP 47113 |
14.11 |
| 2026-09-22 12:00 |
09:36:56.83 |
+53:30:26.8 |
HIP 47113 |
14.74 |
| 2026-09-23 00:00 |
09:37:04.79 |
+53:30:29.9 |
HIP 47113 |
15.44 |
| 2026-09-23 12:00 |
09:37:12.69 |
+53:30:33.8 |
HIP 47113 |
16.20 |
| 2026-09-24 00:00 |
09:37:20.52 |
+53:30:38.3 |
HIP 47113 |
17.00 |
| 2026-09-24 12:00 |
09:37:28.28 |
+53:30:43.6 |
HIP 47113 |
17.85 |
| 2026-09-25 00:00 |
09:37:35.97 |
+53:30:49.5 |
HIP 47113 |
18.74 |
| 2026-09-25 12:00 |
09:37:43.58 |
+53:30:56.1 |
HIP 47113 |
19.65 |
| 2026-09-26 00:00 |
09:37:51.13 |
+53:31:03.4 |
HIP 47437 |
19.07 |
| 2026-09-26 12:00 |
09:37:58.60 |
+53:31:11.4 |
HIP 47437 |
17.97 |
| 2026-09-27 00:00 |
09:38:06.00 |
+53:31:20.1 |
HIP 47437 |
16.88 |
| 2026-09-27 12:00 |
09:38:13.33 |
+53:31:29.5 |
HIP 47437 |
15.81 |
| 2026-09-28 00:00 |
09:38:20.58 |
+53:31:39.6 |
HIP 47437 |
14.76 |
| 2026-09-28 12:00 |
09:38:27.76 |
+53:31:50.3 |
HIP 47437 |
13.73 |
| 2026-09-29 00:00 |
09:38:34.86 |
+53:32:01.8 |
HIP 47437 |
12.71 |
| 2026-09-29 12:00 |
09:38:41.89 |
+53:32:13.9 |
HIP 47437 |
11.72 |
| 2026-09-30 00:00 |
09:38:48.84 |
+53:32:26.7 |
HIP 47437 |
10.76 |
| 2026-09-30 12:00 |
09:38:55.71 |
+53:32:40.2 |
HIP 47437 |
9.84 |
| 2026-10-01 00:00 |
09:39:02.50 |
+53:32:54.4 |
HIP 47437 |
8.95 |
| 2026-10-01 12:00 |
09:39:09.21 |
+53:33:09.3 |
HIP 47437 |
8.12 |
| 2026-10-02 00:00 |
09:39:15.85 |
+53:33:24.9 |
HIP 47437 |
7.36 |
| 2026-10-02 12:00 |
09:39:22.40 |
+53:33:41.1 |
HIP 47437 |
6.67 |
| 2026-10-03 00:00 |
09:39:28.88 |
+53:33:58.1 |
HIP 47437 |
6.10 |
| 2026-10-03 12:00 |
09:39:35.27 |
+53:34:15.7 |
HIP 47437 |
5.67 |
| 2026-10-04 00:00 |
09:39:41.58 |
+53:34:34.0 |
HIP 47437 |
5.40 |
| 2026-10-04 12:00 |
09:39:47.80 |
+53:34:53.0 |
HIP 47437 |
5.32 |
| 2026-10-05 00:00 |
09:39:53.94 |
+53:35:12.7 |
HIP 47437 |
5.43 |
| 2026-10-05 12:00 |
09:40:00.00 |
+53:35:33.0 |
HIP 47437 |
5.72 |
| 2026-10-06 00:00 |
09:40:05.97 |
+53:35:54.1 |
HIP 47437 |
6.15 |
| 2026-10-06 12:00 |
09:40:11.85 |
+53:36:15.8 |
HIP 47437 |
6.70 |
| 2026-10-07 00:00 |
09:40:17.65 |
+53:36:38.2 |
HIP 47437 |
7.34 |
| 2026-10-07 12:00 |
09:40:23.36 |
+53:37:01.3 |
HIP 47437 |
8.04 |
| 2026-10-08 00:00 |
09:40:28.98 |
+53:37:25.0 |
HIP 47437 |
8.78 |
| 2026-10-08 12:00 |
09:40:34.51 |
+53:37:49.5 |
HIP 47437 |
9.56 |
| 2026-10-09 00:00 |
09:40:39.95 |
+53:38:14.6 |
HIP 47437 |
10.37 |
| 2026-10-09 12:00 |
09:40:45.30 |
+53:38:40.3 |
HIP 47437 |
11.18 |
| 2026-10-10 00:00 |
09:40:50.56 |
+53:39:06.8 |
HIP 47437 |
12.02 |
| 2026-10-10 12:00 |
09:40:55.72 |
+53:39:33.9 |
HIP 47437 |
12.86 |
| 2026-10-11 00:00 |
09:41:00.79 |
+53:40:01.7 |
HIP 47437 |
13.70 |